<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    //   let arr = [2, 6, 1, 7, 4];
    //   let sum = 0
    //   sum = Number(sum)
    //   for (let i = 0; i < arr.length; i++) {
    //     document.write(`${arr[i]} `)
    //     sum += arr[i]
    //   }
    //   document.write('<br>')
    //   document.write(sum)
    //   let ave = 0
    //   ave = Number(ave)
    //   ave = sum / arr.length
    //   document.write('<br>')
    //   document.write(ave)
    let arr = [2, 6, 1, 77, 52, 25, 7]
    let max = 0
    let min = arr[0]
    min = Number(min)
    max = Number(max)
    for (let i = 0; i < arr.length; i++) {
      if (arr[i] > max) {
        max = arr[i]
      }
      if (arr[i] < min) {
        min = arr[i]
      }
    }
    document.write(max)
    document.write('<br>')
    document.write(min)
    document.write('<br>')
    document.write(max - min)
  </script>
</body>

</html>